@wrongstack/providers

LLM provider adapters for WrongStack: Anthropic, OpenAI, Google, OpenAI-compatible (Mistral, DeepSeek, xAI/Grok, Groq, Together, Fireworks, OpenRouter, …), plus OAuth-based variants (Claude Pro/Max via "Sign in with Claude", ChatGPT via "Sign in with ChatGPT", GitHub Copilot).

All providers ride a single declarative WireFormatConfig adapter — even the majors (Anthropic / OpenAI / Google) are thin wrappers around their presets. Adding a new OpenAI-compatible provider is usually a 20-line preset, not a new file.

Install

pnpm add @wrongstack/providers @wrongstack/core

@wrongstack/core provides the shared Provider interface, message types, capabilities model, and tool format.

Supported wire families

Tuned presets (auto-registered for matching provider ids)

What's in here

src/
  anthropic.ts             thin WireFormatProvider wrapper (anthropic preset)
  openai.ts                thin WireFormatProvider wrapper (openai preset)
  google.ts                thin WireFormatProvider wrapper (google preset)
  openai-compatible.ts     generic /v1/chat/completions adapter
  anthropic-oauth.ts       Claude Pro/Max OAuth (same wire as anthropic)
  openai-codex.ts          ChatGPT Responses API (OAuth)
  github-copilot.ts        GitHub Copilot (OAuth)
  wire-adapter.ts          base HTTP + SSE streaming for all providers
  wire-format.ts           declarative WireFormatConfig → WireFormatProvider
  presets/                 tuned configs for anthropic / openai / google / mistral / local-llm
  capabilities.ts          resolve capabilities for (provider, model) pairs
  family-capabilities.ts   per-family capability defaults
  sse.ts                   SSE parser with 256 KB buffer cap
  aggregate.ts             tool_use stream-event aggregator
  tool-format/             tools ↔ Anthropic / OpenAI / Responses converters
  stop-reason.ts           normalize provider stop_reason → canonical
  error-parse.ts           parse provider HTTP error envelopes
  index.ts                 factory builder + preset registration

Request parameters

Every provider accepts the canonical Request type from @wrongstack/core. Parameters not supported by a provider are silently ignored at the wire level:

Quick example

import { AnthropicProvider } from '@wrongstack/providers';

const provider = new AnthropicProvider({
  apiKey: process.env.ANTHROPIC_API_KEY!,
});

const stream = provider.stream(
  {
    model: 'anthropic-test-model',
    messages: [{ role: 'user', content: 'hello' }],
    maxTokens: 512,
    temperature: 0.7,
    topK: 40,
    user: 'user-abc',
    reasoning: { enabled: true, effort: 'high' },
  },
  { signal: new AbortController().signal },
);

for await (const event of stream) {
  if (event.type === 'text_delta') process.stdout.write(event.text);
}

Using a preset (OpenAI-compatible service)

Presets are automatically used when the models.dev registry returns a matching provider id. You can also use them directly:

import { createWireFormatFactory, mistralWireFormat } from '@wrongstack/providers';

// Build a factory from the Mistral preset
const factory = createWireFormatFactory(mistralWireFormat, {
  apiKey: process.env.MISTRAL_API_KEY!,
});
const provider = factory.create({ apiKey: process.env.MISTRAL_API_KEY! });

const result = await provider.complete(
  {
    model: 'mistral-large-2506',
    messages: [{ role: 'user', content: 'hello' }],
    maxTokens: 512,
    seed: 42,
    responseFormat: { type: 'json_object' },
  },
  { signal: new AbortController().signal },
);

Wire-format adapter (declarative)

For a new provider that doesn't fit one of the existing presets, write a WireFormatConfig and plug it into WireFormatProvider. See docs/provider-author-guide.md for the full spec.

import { WireFormatProvider, type WireFormatConfig, defineWireFormat } from '@wrongstack/providers';

const myWire = defineWireFormat({
  id: 'myprovider',
  family: 'openai-compatible',
  capabilities: { tools: true, parallelTools: true, vision: false, streaming: true, promptCache: false, systemPrompt: true, jsonMode: false, maxContext: 32_000, cacheControl: 'none' },
  defaultBaseUrl: 'https://api.myprovider.com/v1',
  buildUrl: (baseUrl) => `${baseUrl.replace(/\/+$/, '')}/chat/completions`,
  buildHeaders: (apiKey) => ({ authorization: `Bearer ${apiKey}` }),
  buildBody: (req) => ({ model: req.model, messages: req.messages, max_tokens: req.maxTokens, stream: true }),
  createStreamState: (fallbackModel) => ({ model: fallbackModel, started: false }),
  parseStreamEvent: () => [],
  finalizeStream: () => [{ type: 'message_stop', stopReason: 'end_turn', usage: { input: 0, output: 0 } }],
});

const provider = new WireFormatProvider(myWire, { apiKey: '…' });

Capabilities model

Each provider family has a baseline capability profile in CAPABILITIES_BY_FAMILY. Per-model overrides from the models.dev catalog are AND-ed with the family baseline. The agent uses capabilities to gate vision, reasoning, tool-use, and parameter support.

Capability flags

User-defined model overrides via CustomModelDefinition.capabilities skip the AND gate and take full effect.

Thinking / reasoning

Extended thinking (chain-of-thought) is managed through the Request.reasoning field and works across providers:

• Anthropic: reasoning.enabled → thinking: { type: "enabled", budget_tokens }. The budget is derived automatically from maxTokens and reasoning.effort. Thinking is streamed as thinking_start, thinking_delta, thinking_signature, and thinking_stop events. The signature must be echoed back on the next request — the stream parser handles this automatically.

• OpenAI (o-series models): reasoning.effort → reasoning_effort: "low"|"medium"|"high". Values minimal, xhigh, and max are filtered to avoid provider 400s. Reasoning content from the response (delta.reasoning_content) is echoed back as message.reasoning_content on subsequent turns.

• Gemini: reasoning.enabled → generationConfig.thinkingConfig: { type: "enabled"|"disabled" }.

• OpenAI-compatible: The thinkingParam quirk controls how reasoning is mapped — 'zai-glm' (ZAI reasoning), 'kimi-toggle' (Kimi thinking mode), or 'always-on' (models that always think and reject disable). See CompatibilityQuirks.

Structured output

Set Request.responseFormat to constrain the model's output:

// JSON Schema (OpenAI, Gemini)
{
  type: 'json_schema',
  jsonSchema: {
    name: 'person',
    schema: {
      type: 'object',
      properties: {
        name: { type: 'string' },
        age: { type: 'number' }
      },
      required: ['name', 'age']
    }
  }
}

// Free-form JSON (OpenAI, Gemini)
{ type: 'json_object' }

// Plain text (default)
{ type: 'text' }

• OpenAI → response_format with json_schema or json_object type
• Gemini → responseMimeType: "application/json" + responseSchema (when json_schema)

Safety settings

Gemini supports per-category safety thresholds via Request.safetySettings:

{
  safetySettings: [
    { category: 'HARM_CATEGORY_HARASSMENT', threshold: 'BLOCK_ONLY_HIGH' },
    { category: 'HARM_CATEGORY_HATE_SPEECH', threshold: 'BLOCK_LOW_AND_ABOVE' },
  ],
}

Supported categories: HARM_CATEGORY_HARASSMENT, HARM_CATEGORY_HATE_SPEECH, HARM_CATEGORY_SEXUALLY_EXPLICIT, HARM_CATEGORY_DANGEROUS_CONTENT.

Thresholds: BLOCK_NONE, BLOCK_ONLY_HIGH, BLOCK_MEDIUM_AND_ABOVE, BLOCK_LOW_AND_ABOVE.

Structured error responses

Every provider HTTP error is normalized through parseProviderHttpError() into a ProviderError with:

• status — HTTP status code
• providerId — which provider returned the error
• retryable — whether the agent loop should retry (true for 429/5xx)
• describe() — one-line human-readable description for the CLI/TUI status line

Tool input parsing (parseToolInput)

All providers run tool-call JSON through _tool-input.ts. It guarantees the agent always receives a Record<string, unknown> for tool_use.input, never a parse-error or null. Invalid or non-object inputs are wrapped under { __raw: ... } instead of crashing the provider runner.

Local LLM presets

Presets for Ollama, vLLM, and LM Studio are tuned for local servers:

import { ollamaWireFormat } from '@wrongstack/providers';
import { WireFormatProvider } from '@wrongstack/providers';

const ollama = new WireFormatProvider(ollamaWireFormat, {
  apiKey: '',  // Ollama doesn't use auth
  baseUrl: 'http://localhost:11434/v1',
});

The createLocalLlmPreset() factory lets you create custom local presets with bodyExtras for provider-specific fields (e.g., Ollama's keep_alive, vLLM's repetition_penalty).

OAuth providers

Three providers use OAuth token refresh patterns:

• AnthropicOAuthProvider — Claude Pro/Max "Sign in with Claude". Same wire as the API-key Anthropic family but with Authorization: Bearer and Claude Code identity headers. Tokens self-refresh near-expiry and on 401.

• OpenAICodexProvider — ChatGPT "Sign in with ChatGPT" (Responses API). Uses the OpenAI Responses wire format (not chat/completions). Reasoning effort is configurable via reasoningEffort.

• GitHubCopilotProvider — GitHub Copilot subscription. Wraps the OpenAI-compatible chat endpoint with Copilot editor headers and token-based URL discovery.

All three persist refreshed tokens through the setOAuthTokenPersister hook so new tokens survive session restarts.

License

MIT